"Figure 3: The unexplained infant mortality rate is highest for mothers aged under 20 years","" "Unexplained infant mortality rate by mother’s age, England and Wales, 2004 to 2018","" "","" "Notes","1. Figures are based on death occurrences. 2. Data for 2018 are provisional." "Unit","Deaths per 1,000 live births (rate)" "","" "","Under 20 years ","20 to 24 years","25 to 29 years","30 to 34 years","35 to 39 years","40 years and over" "2004","1.33","0.83","0.40","0.28","0.34","0.24" "2005","1.32","0.85","0.46","0.28","0.28","0.22" "2006","1.30","0.72","0.37","0.20","0.20","0.42" "2007","1.16","0.65","0.39","0.18","0.22","0.24" "2008","1.07","0.68","0.34","0.23","0.26","0.23" "2009","1.23","0.59","0.37","0.26","0.21","0.22" "2010","1.08","0.62","0.33","0.21","0.16","0.18" "2011","0.82","0.53","0.32","0.22","0.23","0.34" "2012","0.92","0.57","0.28","0.21","0.16","0.27" "2013","1.30","0.56","0.29","0.26","0.22","0.34" "2014","1.23","0.57","0.32","0.17","0.16","0.14" "2015","0.79","0.39","0.33","0.20","0.17","0.14" "2016","0.98","0.58","0.32","0.23","0.17","0.34" "2017","1.18","0.52","0.28","0.15","0.18","0.17" "2018","1.11","0.50","0.32","0.18","0.22","0.28"